Dose–response relationship in inferior oblique muscle recession

Abstract

Despite the large variation of effects, a dose-response relationship could be established, facilitating surgical planning. Large vertical deviations with small excyclodeviation are an indication for additional anteropositioning. The torsional effect of inferior oblique muscle recessions can diminish over time.

Minimally invasive strabismus surgery (MISS) for inferior obliquus recession

“…The dose–effect relationship after 6 months for an accommodative near target at 25° adduction was 0.83° ± 0.43° per mm of recession. This value is within the confidence interval of studies using a similar recession technique [ 17 ]. Six months postoperatively, only a minimal cicatrisation was found along the openings, which did not hinder free movement of the conjunctiva over the sclera and muscle.…”

Effects of inferior oblique muscle-weakening surgery on the Bielschowsky head-tilt phenomenon in patients with superior oblique palsy habitually fixating with the paretic eye

“…Mataftsi [27] studied time-related changes after IO weakening in SO palsy, and reported that the corrective amount of vertical and cyclotorsion in the primary position had a tendency to increase at 4 months or longer compared with that within 7 days after surgery. Metten [28] also describes a slight increase in the corrective effect on the primary position after 3 months postoperatively. However, our results show that the corrective effects in the case group did not significantly vary during the observation period.…”

Trochlear Nerve Palsy: A Review of Etiology, Incidence, Diagnostic Methods, and Treatment Alternatives

“…Morad et al [30] reported the mean preoperative central gaze hypertropia of 12.5±6.2 PD had an average correction of 9.1 PD for central gaze and 15.4 PD for contralateral gaze after 10 mm IOR. Metten et al [31] reported dose-response that each mm of IO recession corrects 0.5° (0.5°/mm) in the central position, and up to 1.4° (1.4°/mm) in adduction. Yanyali [32] reported that mean reduction in hypertropia in primary gaze was 18.5 PD in eyes underwent IO anterior transposition, compared to 13.…”